50W Audio Amplifier Using TDA2050 IC | DIY Power Amp Circuit

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Build a powerful 50W audio amplifier using the TDA2050 IC. This DIY project delivers clear sound for speakers and subwoofers. Includes circuit diagram, parts list, and PCB layout.

Introduction

In this project, you will learn how to make a high-quality 50W audio amplifier using the TDA2050 IC. This amplifier is ideal for powering speakers, subwoofers, or creating your own home audio system. The TDA2050 is a powerful audio amp IC that delivers low distortion, high output, and thermal protection—perfect for DIY audio builds.

Features of TDA2050 Amplifier

Output Power: Up to 50W on 4Ω load with ±25V supply
Low Total Harmonic Distortion (THD < 0.05%)
Built-in short-circuit and thermal protection
Compact and simple to build

Materials for the Project

1- 1X TDA2050 IC

2- 1X 1000UF 35V CAPACITOR

3- 2X 100UF 50V CAPACITOR

4- 2X 1UF 50V CAPACITOR

5- 1X 22UF 50V CAPACITOR

6- 1X 0.1 µF NON-POLAR CAPACITOR

7- 1X 470R RESISTOR

8- 4X 47K RESISTOR

9- 1X 50K VARIABLE RESISTOR

10- JUMPER WIRES

11- VERO BOARD

12- HEAT SINK

13- AUDIO JACK

Download Circuit Diagram

Circuit Diagram

Download PCB LAYOUTS

PCB LAYOUTS

⚙️ Working Explanation

The TDA2050 IC is configured in a Class AB amplifier mode, which uses a feedback network to stabilize gain and frequency response. The input audio signal passes through coupling capacitors and resistors that set the gain, while the output is filtered and driven through the speaker load.

This design uses a split power supply (±25V) to allow the output waveform to swing both positively and negatively, giving better efficiency and lower distortion.

Power Supply

For maximum output:

Use a dual rail power supply: ±25V @ 2–3A
You can also use ±18V or ±22V for slightly lower output (~30–40W)

⚠️ Always attach a proper heat sink to the TDA2050 to avoid overheating!

Output Performance

Power Output: ~50W on 4Ω speaker
Frequency Response: 20 Hz–20 kHz
THD: <0.05%
SNR: >90dB

Optional Add-ons

Volume control using a 10k potentiometer
Tone control circuit before input
Speaker protection circuit on output
Bass booster stage (optional)

Video Tutorial

Tips & Recommendations

Use good-quality capacitors (electrolytic + polyester for audio paths)
Keep signal paths short and shielded
Mount the IC on a metal enclosure for better cooling
Avoid ground loop by connecting input and output grounds properly